Stone-saw



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' v STONE SAW. 'N0.334,678. PatentedJan. 19,1886.

NITED STATES PATENT 'rricn.

JAMES PECKOVER, OF PHILADELPHIA, PENNSYLVANIA.

STONE-SAW.

SPECIFICATION forming part of Letters Patent No. 334,678, dated January 19, 1886.

Application filed November 6, 1885. Serial No. 182,039. (No model.)

To all whom it may concern:

Be it known that I, JAMES PEoKoVER, a subject of the Queen of Great Britain and Ireland, and residing in Philadelphia, Pennsylvania, have invented a certain Improved StoneSaw, of which the following is a specification.

The object of my invention is to construct a stone-saw which will be more efficient in its action than saws of the ordinary construction, and this object I attain as hereinafter fully described.

In the accompanying drawings, Figure l is a side view ofa portion of my improved saw. Fig. 2 is a side view of one of the teeth drawn to a larger scale. Fig. 3 is a plan view of the tooth drawn to a still larger scale. Fig. 4 is a perspective view of a portion of the saw provided with one of the teeth, and Fig. 5 is a perspective view of the several parts detached.

In the sawing of stone the cutting action is produced almost entirely by the sand or other granular substance, which is fed into the saw-kerf with the aid of water, and which is intended to find its way under the edge of the saw-blade to cut the stone.

W'ith the ordinary construction of plain saw-blade it is very difficult to get the sand or other grains beneath the edge of the blade; and in order to overcome this difficulty I provide the saw-blade A (which I prefer to make thinner than usual) with side plates, B, at suitable intervals apart, these side plates being provided With inclined upper edges and being riveted to the blade on one or both sides, preferably both. There are thus formed on the face of the saw-blade inclined shoulders b, to facilitate the passage of the sand or other granular material into the kerf below the saw-blade. Below the side plates, B, the blade A is recessed at a for the reception of separate teeth D, the construction of which is somewhat peculiar. These teeth are as thick as the combined thicknesses of the corresponding plates B and blade A, and they have at their upper parts projections d to fit in the recesses a in the blade. These recesses a have at their opposite corners notches a for the reception of lugs d on the projections d. In fitting a tooth to its place these lugs d are bent back, as illustrated in Figs. 2, 3, and 5, to permit the tooth D to be pushed up into the recess a, and then the lugs are straightened by hammering or otherwise, as illustrated in Fig. 4, to retain the teeth in the blade. The under edge of each of these teeth is curved or beveled near its opposite ends at f, so that as the saw is reciprocated the sand or other granular substance will more readily get under the edge of the teeth. To further assist in getting the sand or equivalent down in the saw-kerf underneath the teeth of the saw, I cut inclined grooves e in one or both faces of the teeth, as illustrated more clearly in Figs. 4 and 5.

I prefer to cut in the projections d of each tooth a vertical notch, m, extending into the body of the tooth, so that when the tooth is about worn out it will be worn through to the bottom of the notch, and the two portions of the tooth thus left can be more readily withdrawn from the blade.

In cutting stone with my improved saw the sand or equivalent which is fed down into the kerf quickly slides down over the inclined shoulders I) on the side of the saw-blade and finds its Way down under the lower surfaces 2. The combination of the saw-blade and thickened teeth with side plates having inclined upper edges secured to the blade of the saw abo e the teeth,substantiall y as speci fied.

3. Astone-saw blade provided with teeth having on their sides inclined grooves e, as and for the purpose described.

4. The combination of the saw-blade havinginclined shoulders I) on its side,with teeth having inclined or beveled under surfaces, substantially as setforth.

5. The blade having recesses with notches at the corners thereof, in combination with teeth having notches m extending into their bodies, and having projections adapted to the recesses and notches in the blade, all substantially as and for the purpose set forth.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses: JAMES PECKOVER.

WILLIAM F. DAVIS, HARRY SMITH.

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